To calculate years to retirement, we need to understand the relationship between savings rate, expenses, and the 4% rule (withdraw 4% of your portfolio per year, indexed to inflation). Let's consider an example: if you earn $100,000 per year and save 50% of that, you'll be able to invest $50,000 annually. Assuming a 7% annual return, we can estimate your portfolio's growth over time.
Here's a step-by-step calculation:
- Year 1: $50,000 investment, 7% return = $53,500
- Year 2: $50,000 investment, 7% return on $103,500 = $110,645
- Year 3: $50,000 investment, 7% return on $160,645 = $171,892
As you can see, a high savings rate enables you to build wealth quickly. But how does this translate to years to retirement?
The Impact of Savings Rate on Retirement Timeline
Let's use the 25x rule (save 25 times your annual expenses) to estimate the wealth needed for retirement. If you expect to need $40,000 per year in retirement, you'll need a portfolio of $1,000,000 (25 x $40,000). Using the same example as above, with a 7% annual return and $50,000 annual investment, we can estimate the number of years it will take to reach this goal.
Here's a breakdown of the calculation:
- Year 1: $53,500
- Year 5: $344,919
- Year 10: $934,919
- Year 12: $1,144,919
As you can see, with a 50% savings rate and $40,000 annual expenses, you can estimate that you'll reach your retirement goal in around 12 years.
Expenses and Their Role in Retirement Planning
Expenses also play a critical role in determining your retirement timeline. By keeping your expenses low, you can reduce the amount of wealth you need to build to achieve financial independence. For example, if you can live on $30,000 per year in retirement, you'll need a smaller portfolio than if you require $50,000 per year.
Here's a comparison of the number of years it will take to reach retirement with different expense levels:
- $30,000 annual expenses: 10 years
- $40,000 annual expenses: 12 years
- $50,000 annual expenses: 15 years
As you can see, keeping expenses low can significantly reduce the number of years it will take to reach retirement.
Putting it All Together: A Real-World Example
Let's consider a real-world example to illustrate the power of a high savings rate and low expenses. Suppose you earn $120,000 per year, save 60% of your income, and expect to need $50,000 per year in retirement. Using the 4% rule, you can estimate that you'll need a portfolio of around $1.25 million to retire comfortably. Assuming a 7% annual return, you can use a retirement calculator or spreadsheet to estimate that you'll reach your goal in around 10 years.
For a more detailed discussion on side hustle income and FIRE timeline, you can read our dedicated article on the topic. You can also use the Freedom Calculator to model different scenarios and see how your savings rate affects your retirement timeline.
New to FIRE? See our primer at https://freedomcalc.app/what-is-fire.
With a savings rate of 60% and annual expenses of $50,000, you can estimate that you'll reach financial independence in 10 years, with a portfolio of $1.25 million and an annual return of 7%.
Tools worth looking at
Affiliate links. We may earn a commission if you open an account, at no cost to you.
- Empower — Free net worth tracking, portfolio analysis, and retirement planner. The dashboard serious FIRE chasers actually use.
- Acorns — Round-ups that invest your spare change automatically. The lowest-friction way to start investing if you have been putting it off.
- Wealthfront — Tax-loss harvesting, a 5% cash account, and direct indexing once you cross $100k. Solid robo for the set-and-forget crowd.